That reminds of the time I used MS
Flight Sim to fly around in the area. I'd take off on Kai Tak's RWY 13, turn right, fly south of HK
Island, go over the Pearl Delta, turn right, do a touch and go in Macau, head north to Shenzen, do a 180 degree turn, touch and go in Shenzen and back to Kai Tak.
Btw, when Kai Tak's RWY 31 was in use (which was shorter because of the displaced threshold on RWY 13) UA
747s on the HKG
routes flew to Macau with almost empty tanks, fuelled up there and used the longer Macau runway to get airborne with a heavy load.